Increasing control's height does not overlay control underneath

[mscertified]

I have a form that contains a listbox and underneath it a tab control. There
is a button alongside the listbox that is used to maximize/minimize the
listbox height (overlaying the tab control).

One of the tabs on the tab control contains another listboxes.
When I maximize the upper listbox, the listbox on the tab 'shows thru' the
maximized listbox. I'm getting around it by making the underneath listbox
temporarily invisible.
Any clue as to what could cause this ??? I'm using Access 2003 under Win XP.

 

[John Smith]

Controls have a 'Z-Order', though I don't know where the property is! In
design view select Format/Send to Back for the lower list box and it should
stay behind the upper list box.

HTH
John
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